Looper-actuating mechanism for sewing machines



Dec. 9, 1930. A. B. CLAYTON 1,784,512

LOOPER ACTUATING ME ICHANISM FOR SEWING MACHINES Qlfiginal Filed Jan. 2a, 1928 N INVENTOR 47mm my I BY ATTOR N EY fill Patented Dec. 9, 1930 UNITED STATES AT-ET O FIC 727 ANDREW BNCLAYTON, or UNION, NEW JEnsEtnssIGNoaTo 'rrrnsINs-En MANUFAC- TUBING COMPANY, or ELIZABETH, NEW annsnna CORPORATION on NEW JERSEY LOOPER-ACTUATING MECHANISM Font sEwfNG MAc'HINEs i ing movement of the looper-shaft is derived from a bell-crank and link connection with the needle-bar operating rock-shaft, which, in turn, is actuated by a crank-and-pitman connection with the main-shaft.

The invention will be, better understood by referring to the accompanying drawings in which Fig. 1 is a side view, in section, of

the entire sewing machine, and Fig. 2 is a section on the line 2-2, Fig. 1.

Inthe preferred embodiment of the inven- 7 tion illustrated, 1 represents the standard of the sewing machine and 2 the overhanging bracket-arm which terminates in the, head 3. Projecting horizontally from the standard 1, below the arm 2, is the cylinder-bed 4. J ournaled in bearings 5, 6 and 7' is the mainshaft Swhich extends within and lengthwise of the cylinder-bed 4 and terminates at the .point 9, Fig. 2, about mid-way of the length of the cylinder-bed. The main-shaft 8 is formed with the crank 10 which is connected by the pitman 11 to the ball 12 on one arm 13 of a double crank fixed tothe needle-bar operating rock-shaft 14 which, at its forward end, has the usual crank 15 and link-connection 16 with the reciprocating needle-bar 17 carrying the eye-pointed needles 18. The presser-foot 19 is carried, as usual, by the downwardly spring-pressed presser-bar 20.

Cooperating with the presser-foot 19 to feed the work across the cylinder 4 is the four-motion feed-dog 21 preferably actuated by the mechanism disclosed in my copending application, Serial No. 250,111, filed Janu- Original application filed January as, 1928, Serial No. 2'50,111.' Divided and this ap licatio filed October 11, 1928. Serial No. 311,736.

which thi'sap'plication is a division.

ary28, 192s, of

Y The loopers 22, which cooperatewith the,

needles, 18, are secured'to the looper-carrier 23 which is fixed'to the forward end of the rocking andsliding looper-shaft 24 journale'd inthe cylinder-bed below the mainshaft 8.. The slidin movement of the loopershaft 24, whichimparts theloop-seizing and -shedding movements to the loopers, is derlved'thr'ough a tram of connections. wlth the arm 25 of the double-armedlever 13, 25"

fixed to e the needle-bar operating rock-shaft 14. The arm 25 carriesa ball26'to which is connected the upperfrend of a link 27 connected at its lower end to the ball 28- on the horizontal arm 29 of a bell-crank lever 29, 30 fulcrumed on the shaft 31 in the standard. The bell-crank lever-arm 30 is forked at its upper end to embrace the split slide-block 32 which, in turn, embraces the ball-ended arm 33 fixed to the looper-shaft 24.

The needle-avoiding movement of the loopers 22 is produced by a rocking motion of the looper-shaft 24 which is derived from the eccentric 34 on the main-shaft. Theeccentric 34 is surrounded by the split-block 35 the flat sides of which are embraced by the forked upper end of the arm 36, fixed to the looper-shaft 24. The eccentric 34 and split block 35 are'longv enough to accommodate the movements of the arm 36 with the shaft 24 lengthwise of the cylinder-bed.

Having thus set forth the nature .of the invention, what I claim herein is 1. In a sewing machine, a frame comprising a standard, a bracket-arm, and a cylinder-bed, a main-shaft journaled in line. with and extending into said'cylinder-bed, a rocking and sliding looper-supporting shaft journaledin and lengthwise of said cylinderbed below said main-shaft, operative coning a standard, a bracket-arm, and a cylin- 2 Y i f 1,784,512

der-bed, a main-shaft ournaled in line with er-supporting shaft and slidably embracing 7 said eccentric. v

3. In a sewing mach1ne,a frame comprismg a standard, a bracket-arm and a cylinder-bed, a main-shaft journaled in line with and extending into said cylinder bed, arock- 'ing and sliding looper-sup-porting shaft journaled in and lengthwise of said cylinder-bed, an eccentric on the main-shaft within said cylinder-bed, means embracing said eccentric for rocking said looper-shaft, a lateral arm on the looper-supporting shaft within the standard, a bellcrank lever hav ing one of its arms forked to slidably embracesaid lateral arm, and an operative connection between the main-shaft and the other arm of said bell-crank lever.

In testimony whereof,][ have signed my name to this specification.

' ANDREWYB. CLAYTON. V a 

